Fort Walton Beach — 2017 Consumer Water Quality Report — reading text

of which you 2017 WATER TESTING RESULTS might not be familiar. To help you INORGANIC CONTAMINANTS better understand these terms, we have Dates of MCL Range provided the following definitions: Contaminant and Unit Level sampling Violation of MCLG MCL Likely Source of Contamination n/a: not applicable of Measurement Detected (mo./yr.) (Yes/No) Results ND: means not detected and indicates that the Discharge of drilling wastes; discharge from metal refineries; erosion of Barium (ppm) May 2017 No 0.35 0.005-0.35 2 2 substance was not found by laboratory analysis. natural deposits Erosion of natural deposits; discharge from fertilizer and aluminum Parts per million (ppm) or milligrams per liter Fluoride (ppm) May 2017 No 1.1 0.45-1.1 4 4.0 factories. Water additive which promotes strong teeth when at the optimum (mg/l): one part by weight of analyte to one million level of 0.7 ppm parts by weight of the water sample. Lead (point of entry) Residue from man-made pollution such as auto emissions and paint; lead Parts per billion (ppb) or micrograms per liter May 2017 No 1 ND-1 0 15 (µg/l): one part by weight of analyte to one billion (ppb) pipe, casing, and solder parts by weight of the water sample. Sodium (ppm) May 2017 No 110 35-110 n/a 160 Salt water intrusion, leaching from soil Picocuries per liter (pCi/L): measure of the VOLATILE ORGANIC CONTAMINANTS radioactivity in water. Action Level (AL): the concentration of a ND- Xylenes (ppm) June-Dec 2017 No 0.001 10 10 Discharge from petroleum factories; discharge from chemical factories contaminant which, if exceeded, triggers treatment 0.001 or other requirements which a water system must RADIOACTIVE CONTAMINANTS follow. Jan & May Alpha emitters (pCi/L) No 2.7 ND-2.7 0 15 Erosion of natural deposits Maximum Contaminant Level or MCL: the 2017 highest level of a contaminant that is allowed in Radium 226 +228 or Jan & May drinking water. MCLs are set as close to the combined radium No 1.49 0.4-1.49 0 5 Erosion of natural deposits MCLGs as feasible using the best available 2017 (pCi/L) treatment technology. STAGE 2 DISINFECTANTS AND DISINFECTION BY-PRODUCTS . Maximum Contaminant Level Goal or MCLG: MCL or Disinfectant or Dates of Range the level of a contaminant in drinking water below MRDL Level MCLG or MCL or Contaminant and Unit sampling of Likely Source of Contamination which there is no known or expected risk to health. Violation Detected MRDLG MRDL of Measurement (mo./yr.) Results MCLGs allow for a margin of safety. (Yes/No) Maximum residual disinfectant level or MRDL: Chlorine (ppm) – MRDLG MRDL the highest level of a disinfectant allowed in Jan-Dec 2017 No 0.74 0.53-0.86 Water additive used to control microbes Stage 1 =4 = 4.0 drinking water. There is convincing evidence that Haloacetic Acids (five) addition of a disinfectant is necessary for control of July 2017 No 5.9 3.95-5.9 n/a MCL = 60 By-product of drinking water disinfection microbial contaminants. (HAA5) (ppb) TTHM (Total Maximum residual disinfectant level goal or July 2017 No 33.5 26-33.5 n/a MCL = 80 By-product of drinking water disinfection MRDLG: the level of a drinking water disinfectant trihalomethanes) (ppb) below which there is no known or expected risk to LEAD AND COPPER (TAP WATER) health. MRDLGs do not reflect the benefits of the Dates of AL 90th No. use of disinfectants to control microbial Contaminant and Unit AL (Action Sampling Exceeded Percentile Exceeding MCLG Likely Source of Contamination contaminants. of Measurement Level) (mo./yr.) (Yes/No) Result the AL Copper (tap water) Corrosion of household plumbing systems; erosion of natural deposits; Jun-Sept 2017 No 0.22 0 of 30 1.3 1.3 (ppm) leaching from wood preservatives Lead (tap water) (ppb) Jun-Sept 2017 No 2.3 1 of 30 0 15 Corrosion of household plumbing systems; erosion of natural deposits